Just received 4 Dymond D60's yesterday. Lots of guys use these on their hotliners flying 100+ mph. The specs look good and they are nice and narrow (for narrow wing install.) Ive used the JR241's (slow) Cirrus (reliability issues, poor centering) BMS 371's & 306's (probably best bang for your buck, pretty good little servos) Hitec 55's & 56's (never had a problem though 56's have a MUCH stronger geartrain).

Look into Dymond. They have a little more torque than most micros. I wouldnt worry too much about the minor differences in rotational speed in some of the comparisons as you may never even notice it.

I don't think there is any servo on the market that is less than 10g and with metal gears.
Also it has been measured that some Graupner (and other brand) digital servos are actually weaker than their analog counterparts and feature no specific advantages as to centering & precision.
The best seem to be Dymond D60, C261 & 271 (metal version of the same, heavier), and Hitec 56HB.
Thinnest is D60 @ 9mm.
There are all relatively slow although C271 seems a tad faster.

The slimmest metal servo I think is Futaba S3150, it is digital and *very* good although a bit slow as well, but weights already 22g. Used for larger airframes including F3B (submitted to 60G loads !!)

You should be safe with the D60, they are very precise and tough even with plastic gears and they are used in many F5B & F5D.

I stand by my JR-241s (analogue) but want to try some of the D60's when I get the chance.
Bertrand, I would not worry about the difference in speed. Worry about centering, strong gears, and reliability. I see the F-16 is using full flying stabs so you will need a strong servo with good centering. Is that the same size as the Kyosho F-16??

i would go for a fma ps10 servo. they perform like an hs-55 but are a fair bit faster and they weigh about 2g less. im not sure it will fill the bill for torque, but i would guess they would do very well. they do make some interesting claims as to how they are 'smoother' than slightly cheaper servos. so i would guess that if there is any truth to it they are a little more precise. its something about a new chip they use or something, check them out.

im pritty sure they would be fast enough. i certanly know im faster than my hs-55's but they usualy do real well anyhow. if you want some budget speed, i would get some gws naros. and they have some decent torque. the weight is what you trade, of course, and some money too.